Fomantic-UI is the official community fork of Semantic-UI

Atoms for Blaze UI

A lightweight and modular front-end framework for developing fast and powerful web interfaces

A utility-first CSS framework for rapid UI development.

A minimalist CSS framework.

Spectre.css - A Lightweight, Responsive and Modern CSS Framework

👜 A beautiful CSS library to kickstart your projects

Minimal CSS Framework for semantic HTML

Primer is GitHub's design system. This is the CSS implementation

Lit is a simple library for building fast, lightweight web components.